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CSV to NDJSON

Convert each CSV row into newline-delimited JSON for APIs, logs, BigQuery, and data pipelines. Process locally in your browser with HappyCSV.

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How to use this tool

Quick start

Built for creating json lines for apis, logs, bigquery, and streaming-style pipelines.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A newline-delimited JSON file.

  1. 1Upload a CSV.
  2. 2Review one JSON object per row.
  3. 3Download the NDJSON file.

How to CSV to NDJSON

  1. 1Upload a CSV.
  2. 2Review one JSON object per row.
  3. 3Download the NDJSON file.

Why Use This Tool?

  • ✓Convert each CSV row into newline-delimited JSON for APIs, logs, BigQuery, and data pipelines.
  • ✓A newline-delimited JSON file.
  • ✓Files are processed locally in this browser.
  • ✓Keep the source file and review the result before importing it elsewhere.

Frequently Asked Questions

What does this tool support?

A newline-delimited JSON file.

What are the processing limits?

Up to 100 MB per CSV, 20 MB per complex document; 250,000 rows, 1,000 columns, 2 million cells, and 128 MB output. Jobs stop after two minutes. Large files may need splitting.

Are my files uploaded?

No. File processing stays in your browser. Files are not automatically saved for the next visit.

Can I process multiple files?

This tool processes one file at a time.